By Matt Hardy Premiership rugby club Harlequins’ showpiece annual game, Big Game, has been thrown into doubt over rail strikes on 27 December. In an alleged email seen by City A.M. and posted into a fan forum, fans were told that the club had taken the “extremely difficult decision to postpone the Big Game 14 fixture at Twickenham”. The fixture regularly sees upwards of 70,000 fans at the home of English rugby and is a cash cow for the London club. “The Club is aware of speculation around Big Game 14 on 27 December at Twickenham stadium in light of the current RMT industrial action,” a stateme…